Making the Ioniq slippier

[Phase]

Originally Posted by aerohead

Thanks! That's helpful.
1) The VG on the mirror is for acoustics. Noise showed up the aero-acoustic wind tunnel and the aerodynamic engineers were able to shift the resonant frequency of the mirror unit by adding the VG ( a very cheap modification to the tooling ) to kill off the offensive noise source.
2) Wheel covers won't be improved upon at any cost.
3) the forwards portion of the belly looks good up to the rear wheel region, then is compromised on account of the exhaust, heat, and carbon-monoxide.
4) Additional heat-shields could be placed strategically.
5) Fiberglass racing exhaust wrap could solve some heat flux issues.
6) Sheet aluminum would be a natural for this area.
7) The 'diffuser' isn't a 'diffuser'. It's just styling.
8) A 'real diffuser should follow where the bottom of quarter-panels project. If it can be worked out around the muffler issue.
9) Aerodynamically, with any tail extension, only the portion of the taillights, up to their burst-edges, would remain visible.
10) The existing rear spoiler would remain in place, just as it is.
11) A new tail upper would integrate to the spoiler's trailing edges.
12) New side extensions would integrate to the existing burst edges .The rear DOES have some existing boat-tailing, so you'd take advantage of that, and add to it, respecting the same contour as you have on the roof, if you can. No more. No less.
13) New diffuser would rise and extend along the path already established by the bottom of the rear quarter panels.
14) New taillights would have to be added, along with relocation of the license plate.
15) If you could relocate the backup camera, and extend the harness, you could maintain that function.
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A sophisticated and complex build! Your passport into Low-Drag Nation.

so whats the best way to go about creating a smooth and angled up rear diffuser? id need some clearance and something heat resistant to get around that muffler

hypothetically guessing, what would my CD drop down to by removing the side mirrors, adding rear wheel skirts, and smoothing out the underside and having a rear diffuser? no upper spoiler or boat tailing done

[freebeard]

hypothetically guessing..

....leads to push-back from the testing rules contingent. They're not wrong.

Here's my example:



The hollow bulkhead represents the extent of the stock body at 100% truncation*. The solid bulhead is where I wanted an upright stack on a 4 into 1 header. Perforated, inside a concave stainless steel deflector.

To accelerate the wake away from the body to the tune of 1500 cubic feet/minute.

*Would deprove the engine cooling.

[aerohead]

Originally Posted by Phase

so whats the best way to go about creating a smooth and angled up rear diffuser? id need some clearance and something heat resistant to get around that muffler

hypothetically guessing, what would my CD drop down to by removing the side mirrors, adding rear wheel skirts, and smoothing out the underside and having a rear diffuser? no upper spoiler or boat tailing done

1) First, you need to scout out opportunities for attachment points.
2) The fuel tank needs to be 'fire-walled' away from exhaust heat.
3) Metallic heat shields can be fabricated and attached to the hidden side of belly panels.
4) The exhaust pipe itself wrapped in fiberglass racing wrap.
5) The lower A-arms of the rear suspension may be able to carry their own belly panels.
6) Everything which doesn't 'move' can have a frame structure attached below, from which the skins are secured. This will also define the upsweep of the diffuser section.
7) Aluminum, directly under the muffler would be immune to its heat.
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8) A dual mirror delete would be in the neighborhood of delta Cd 0.0125
9) Rear skirts netted Covington Univ. delta-Cd 0.0063 ( 2.1% ), perhaps an okay working number.
10) The rear belly section with slow diffuser (2.8-degree) was delta-Cd 0.02 ( Audi & FIAT ) if memory serves me.
If so, we're looking @ an est. Cd 0.2012.
If we were millionaires we could actually know.

[freebeard]

Quoth DDG

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[Phase]

Originally Posted by aerohead

1) First, you need to scout out opportunities for attachment points.
2) The fuel tank needs to be 'fire-walled' away from exhaust heat.
3) Metallic heat shields can be fabricated and attached to the hidden side of belly panels.
4) The exhaust pipe itself wrapped in fiberglass racing wrap.
5) The lower A-arms of the rear suspension may be able to carry their own belly panels.
6) Everything which doesn't 'move' can have a frame structure attached below, from which the skins are secured. This will also define the upsweep of the diffuser section.
7) Aluminum, directly under the muffler would be immune to its heat.
--------------------------------------------------------------------------------------
8) A dual mirror delete would be in the neighborhood of delta Cd 0.0125
9) Rear skirts netted Covington Univ. delta-Cd 0.0063 ( 2.1% ), perhaps an okay working number.
10) The rear belly section with slow diffuser (2.8-degree) was delta-Cd 0.02 ( Audi & FIAT ) if memory serves me.
If so, we're looking @ an est. Cd 0.2012.
If we were millionaires we could actually know.

whats the cheapest way about going about the rear section? im doing this to save money in the long run

kind of bummed that wheel skirts have a smaller impact than simple side mirrors

[freebeard]

Trailer hitch receiver mounted box.

[Phase]

Originally Posted by freebeard

Trailer hitch receiver mounted box.

That sounds like the route I may have to go for long road trips. Idk how id get around the license plate and brake light thing with that?

And I meant cheapest with building a proper rear undertray and diffuser

I’m heading to the Oregon coast this weekend and have a friend with a shop and can lift the car up so I’ll try and get really good under body pictures and I’ll probably smooth out the existing front splash pad with some flex seal or something while it’s up in the air

[freebeard]

Trailer tail light wiring socket

I'm hoarding a pair of Nissan Pulsar NX tail lights for just such a situation.


https://external-content.duckduckgo....6pid%3DApi&f=1

[Phase]

Is there an easy way to mount rear wheel skirts into the existing bolts and trim clips in the wheel well? I’d weld some brackets angled about 90 degrees in a few spots around the wheel skirt

[freebeard]

ecomodder.com: DIY: plastic rear wheel skirts (Geo Metro)